Magic on the Hunt (Allie Beckstrom, Book 6)

There aren't many girls who can say they've gone into the realm of death and lived to tell the tale. But to restore her lover Zayvion's soul, Allison Beckstrom had to pay a bitter price-- and things are about to get worse...
It turns out the leader of the Authority, the council that decides what can--and can't--be done with magic, is being held hostage. But when the trail leads Allie and Zayvion to the secret prison where the Authority locks away magical criminals who are too dangerous to be held anywhere else, they find more than they bargained for.
An undead magic user has possessed one of the prisoners, and he wants his freedom--and then some. Now Allie and Zayvion are the first line of defense against the chaos he's about to unleash on the city of Portland....